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SQL · Theory

INSERT()()

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Theory

142/439

INSERT()()

INSERT() is a MySQL string function — it takes text and returns text or a number. You use it in SELECT (and sometimes WHERE/UPDATE). It does not change stored data unless you UPDATE … SET col = INSERT(col).

Board: SELECT INSERT(name) FROM students; Run it. Say the result out loud. If the column is NULL, the result is often NULL — wrap with IFNULL if you need a blank instead.

String indexes in MySQL start at 1, not 0 (SUBSTR, INSTR, LEFT). NULL input often yields NULL. Try it on one row first.

Interview — name INSERT, one argument list, one example on the students table. Don’t recite every string function.

On the example next to this theory — INSERT()() — iNSERT adds rows. List columns explicitly for clarity.

Exam tip

Say what INSERT returns, then SELECT INSERT(name) FROM students;

INSERT()() — sample query

CREATE TABLE products (id INTEGER PRIMARY KEY, name TEXT, price REAL);
INSERT INTO products (id, name, price) VALUES
  (1, 'Mouse', 499),
  (2, 'Keyboard', 999);
SELECT * FROM products;

INSERT()() — iNSERT adds rows. List columns explicitly for clarity.

Short notes

  • DefINSERT() is a MySQL string function — it takes text and returns text or a number.
  • RuleSELECT INSERT(name) FROM students;
  • TrapNULL input often yields NULL. Try it on one row first.

Questions

1

What does INSERT do?

2

Does it UPDATE the table?

142 / 439

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